Abstract MySpace layouts can mean a lot of different things as you've probably gathered by now. In fact, I'm gambling that you've hit some sites providing layouts that were decidedly not abstract. Here, however, you'll get the real McCoy.
Here's an unusual premade MySpace overlay which employs a kind of a "ripped paper" header style. Your links go on the left in a vertical menu, your content (pic, blurb and videos) go in the center and your music player (optional) and top friends box go on the right.
Check out this screenshot: